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Implement DISTINCT clause

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This commit is contained in:
Pijus Kamandulis
2024-02-27 21:10:03 +02:00
parent f3f3966dd5
commit 5ff923ce2c
6 changed files with 1017 additions and 913 deletions
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32
parsers/nosql/nosql.peg
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@@ -3,24 +3,32 @@ package nosql
import "github.com/pikami/cosmium/parsers"
func makeSelectStmt(columns, table, whereClause interface{}, count interface{}, orderList interface{}) (parsers.SelectStmt, error) {
func makeSelectStmt(
columns, table,
whereClause interface{}, distinctClause interface{},
count interface{}, orderList interface{},
) (parsers.SelectStmt, error) {
selectStmt := parsers.SelectStmt{
SelectItems: columns.([]parsers.SelectItem),
Table: table.(parsers.Table),
}
switch v := whereClause.(type) {
case parsers.ComparisonExpression, parsers.LogicalExpression, parsers.Constant, parsers.SelectItem:
selectStmt.Filters = v
}
switch v := whereClause.(type) {
case parsers.ComparisonExpression, parsers.LogicalExpression, parsers.Constant, parsers.SelectItem:
selectStmt.Filters = v
}
if distinctClause != nil {
selectStmt.Distinct = true
}
if n, ok := count.(int); ok {
selectStmt.Count = n
}
if orderExpressions, ok := orderList.([]parsers.OrderExpression); ok {
selectStmt.OrderExpressions = orderExpressions
}
if orderExpressions, ok := orderList.([]parsers.OrderExpression); ok {
selectStmt.OrderExpressions = orderExpressions
}
return selectStmt, nil
}
@@ -136,13 +144,17 @@ Input <- selectStmt:SelectStmt {
return selectStmt, nil
}
SelectStmt <- Select ws topClause:TopClause? ws columns:Selection ws
SelectStmt <- Select ws
distinctClause:DistinctClause? ws
topClause:TopClause? ws columns:Selection ws
From ws table:TableName ws
whereClause:(ws Where ws condition:Condition { return condition, nil })?
orderByClause:OrderByClause? {
return makeSelectStmt(columns, table, whereClause, topClause, orderByClause)
return makeSelectStmt(columns, table, whereClause, distinctClause, topClause, orderByClause)
}
DistinctClause <- "DISTINCT"i
TopClause <- Top ws count:Integer {
return count, nil
}